Auferheide and the ROC investigators report results of a huge randomized trial testing the ITD. 8,718 victims of out-of-hospital cardiac arrest were randomized to receive the ITD or a sham device during CPR. There was no difference in the primary outcome (6% in each group were alive and able to walk and toilet unassisted at discharge), nor in any secondary outcome (survival to admission or to discharge; return of spontaneous circulation at arrival to the ED).